EP3780277A1 - Antenna device and antenna array - Google Patents
Antenna device and antenna array Download PDFInfo
- Publication number
- EP3780277A1 EP3780277A1 EP18919437.6A EP18919437A EP3780277A1 EP 3780277 A1 EP3780277 A1 EP 3780277A1 EP 18919437 A EP18919437 A EP 18919437A EP 3780277 A1 EP3780277 A1 EP 3780277A1
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- antenna device
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- dielectric substrate
- strip lines
- strip
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- 239000000758 substrate Substances 0.000 claims description 93
- 239000004020 conductor Substances 0.000 description 15
- 230000005855 radiation Effects 0.000 description 14
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000005672 electromagnetic field Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000001902 propagating effect Effects 0.000 description 4
- 238000005388 cross polarization Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/206—Microstrip transmission line antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
- H01Q21/12—Parallel arrangements of substantially straight elongated conductive units
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
- The present invention relates to an antenna device including a dipole array antenna.
- Conventionally, a dipole array antenna that radiates a polarized wave parallel to a signal line is known (see, for example, Patent Literature 1).
- Patent Literature 1:
JP 2003-168922 A - The dipole array antenna disclosed in
Patent Literature 1 is a traveling-wave dipole array antenna in which electric power is distributed to a plurality of dipole elements from a microstrip line by an impedance transformer. In the dipole array antenna disclosed inPatent Literature 1, the dipole elements are arranged on two signal lines, one signal line provided on the front surface of a substrate and other signal line provided on the back surface of the substrate at a corresponding position of the signal line on the front surface. - When the dipole array antenna disclosed in
Patent Literature 1 is excited, a polarized wave parallel to the signal line is radiated in a broadside direction. In order to radiate a polarized wave perpendicular to the signal line with such a dipole array antenna, it is necessary to connect the dipole element rotated by 90 degrees to the microstrip line via a bypass line such as a bending structure. With this structure, a transmission loss is increased particularly in a high frequency band. - As described above, the dipole array antenna disclosed in
Patent Literature 1 has a problem in that a transmission loss is large when a polarized wave perpendicular to the signal line is radiated as an electromagnetic wave in the broadside direction. - The present invention is intended to solve the above problem, and an object of the present invention is to provide an antenna device capable of efficiently radiating a polarized wave perpendicular to a signal line in the broadside direction.
- The antenna device according to the present invention includes:
a first ground provided on a first surface and having a strip shape; a plurality of first strip lines provided on the first surface, each of the first strip lines being disposed along a longitudinal direction of the first ground; a plurality of holes provided in the first ground; a signal line provided on a second surface facing opposite to the first surface, the signal line being parallel to the first ground; and a plurality of branch lines provided on the second surface and branched from the signal line. The strip shape of the first ground is parallel to the signal line. Each of the first strip lines is a strip line extending from the first ground. Each of the holes intersects with a straight line along a corresponding one of the first strip lines. Each of the branch lines intersects with a corresponding one of the holes located on the first surface when viewed transparently from the second surface side. - According to the present invention, the antenna device includes: a first ground having a strip shape parallel to the signal line; a plurality of first strip lines each extending from the first ground; a plurality of holes intersecting with respective straight lines along the strip lines; and a plurality of branch lines, each branch line intersecting with the corresponding hole located on the first surface as viewed transparently from the second surface side. A current in the branch portions where the branch lines are branched from the signal line is increased, so that the strip lines are supplied with electric power by electromagnetic coupling using the holes. As a result, the antenna device can efficiently radiate a polarized wave perpendicular to the signal line in the broadside direction.
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FIG. 1A is a plan view showing a configuration on the front surface side of an antenna device according to a first embodiment of the present invention.FIG. 1B is a plan view showing a configuration on the back surface side of the antenna device according to the first embodiment of the present invention. -
FIG. 2 is a perspective view showing a configuration of a modification of the antenna device according to the first embodiment. -
FIG. 3 is a plan view showing a configuration of a modification of the antenna device according to the first embodiment. -
FIG. 4 is a perspective view showing a configuration of a modification of the antenna device according to the first embodiment. -
FIG. 5 is a graph showing a simulation result of electromagnetic field of the antenna device according to the first embodiment. -
FIG. 6 is a graph showing a simulation result of electromagnetic fields of radiation patterns of electromagnetic waves radiated from the antenna device according to the first embodiment. -
FIG. 7 is a plan view showing a configuration of an array antenna according to the first embodiment. -
FIG. 8 is a perspective view showing a configuration of an antenna device according to a second embodiment of the present invention. -
FIG. 9 is a perspective view showing a configuration of an antenna device according to a third embodiment of the present invention. - In order to describe the present invention in more detail, a mode for carrying out the present invention will now be described with reference to the accompanying drawings.
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FIG. 1A is a plan view showing the configuration on the front surface side of anantenna device 1 according to the first embodiment of the present invention, and shows the front surface of theantenna device 1.FIG. 1B is a plan view showing the configuration on the back surface side of theantenna device 1 according to the first embodiment of the present invention, and shows the back surface of theantenna device 1. Note that, inFIG. 1A , the elements on the back surface side are indicated by broken lines in order to show the positional relationship between the elements on the back surface side and the elements on the front surface side of theantenna device 1. In a case where one of surfaces of adielectric substrate 2 is defined as the back surface and the other surface of thedielectric substrate 2 is defined as the front surface, the back surface of thedielectric substrate 2 is defined as a first surface, and the front surface of thedielectric substrate 2 is defined as a second surface. - The
antenna device 1 shown inFIG. 1 includes thedielectric substrate 2 which is a first dielectric substrate, and conductor patterns formed on both surfaces of thedielectric substrate 2. As shown inFIG. 1A , afeed 3, asignal line 4a, andbranch lines 5a to 5d are provided on the front surface of thedielectric substrate 2. As shown inFIG. 1B , aground 4b is provided on the back surface of thedielectric substrate 2. Theground 4b is provided withslots 6a to 6d. Further,strip lines 7a-1 and 7a-2,strip lines 7b-1 and 7b-2,strip lines 7c-1 and 7c-2, andstrip lines 7d-1 and 7d-2 are provided on the back surface of thedielectric substrate 2. - The
feed 3 is connected to thesignal line 4a. Theantenna device 1 is supplied with power from thefeed 3. Thesignal line 4a is a line through which a high frequency power input to thefeed 3 propagates, and is also called an electric supply line. Thefeed 3 shown inFIG. 1A is on the right side of thedielectric substrate 2 inFIG. 1B showing the back surface side. Theground 4b is a first ground having a strip shape parallel to thesignal line 4a, and has a width smaller than the length of a dipole constituted by thestrip line 7a-1 and thestrip line 7a-2 via theground 4b. The length of the dipole is a half the wavelength of the working frequency of theantenna device 1. Further, as shown inFIG. 1A , thesignal line 4a is provided on the front surface of thedielectric substrate 2 at a position corresponding to theground 4b. - Each of the
branch lines 5a to 5d is a line branched from thesignal line 4a, and has a shape in which, for example, the leading end of a strip-shaped conductor pattern extending from thesignal line 4a is bent toward thefeed 3. Further, each of thebranch lines 5a to 5d has a length one-fourth the wavelength of the working frequency of theantenna device 1, and operates as an open stub. Each of theslots 6a to 6d is a hole provided along the longitudinal direction of theground 4b, and has, for example, a rectangular hole shape that is long along the longitudinal direction of theground 4b. Each of theslots 6a to 6d has a length 0.32 times the wavelength of the working frequency of theantenna device 1, and a width 0.026 times the wavelength of the working frequency of theantenna device 1. - As shown in
FIG. 1B , thestrip lines 7a-1 to 7d-1 and thestrip lines 7a-2 to 7d-2 are first strip lines extending from positions opposite to each other with respect to the width direction of theground 4b. For example, each of thestrip lines 7a-1 to 7d-1 and thestrip lines 7a-2 to 7d-2 has a length 0.10 times the wavelength of the working frequency of theantenna device 1, and has a width 0.026 times the wavelength. The strip lines 7a-1 to 7d-1 and thestrip lines 7a-2 to 7d-2 are sequentially arranged along the longitudinal direction of theground 4b on the back surface of thedielectric substrate 2. InFIG. 1B , a straight line a indicated by a broken line is a straight line along the first strip line, and this straight line a is orthogonal to theground 4b. The spacing between the adjacent strip lines such as thestrip line 7a-1 and thestrip line 7b-1 has a length 0.64 times the wavelength of the working frequency of theantenna device 1. - As shown in
FIG. 1A , thebranch lines 5a to 5d and theslots 6a to 6d are located on the different side of thedielectric substrate 2. Each of thebranch lines 5a to 5d intersects thecorresponding slot 6a to 6d when viewed transparently. For example, thebranch line 5a intersects with thecorresponding slot 6a located on the back surface of thedielectric substrate 2, when viewed transparently from the front surface side. Each of the relations between thebranch lines 5b to 5d and theslots 6b to 6d is similar to the above mentioned relation. As shown inFIG. 1B , theslots 6a to 6d are perpendicular to the respective straight lines a along the first strip lines. For example, the straight line a along thestrip lines 7a-1 and 7a-2 is perpendicular to theslot 6a in such a manner that the line a passes through the central portion of theslot 6a in the longitudinal direction. This can be similarly said to the relation between thestrip lines 7b-1 and 7b-2 and theslot 6b, the relation between thestrip lines 7c-1 and 7c-2 and theslot 6c, and the relation between thestrip lines 7d-1 and 7d-2 and theslot 6d. - Next, the operation will be described.
- In the following, a case where the
antenna device 1 is used as a transmission antenna will be described. - A high frequency power input from an RF connector to the
feed 3 propagates through thesignal line 4a from thefeed 3. Thebranch lines 5a to 5d branched from thesignal line 4a are each an open stub having a length one-fourth the wavelength of the working frequency of theantenna device 1, and the high frequency power propagating through thebranch lines 5a to 5d are reflected. Therefore, the current is increased at the branch portions between thesignal line 4a and thebranch lines 5a to 5d. - Due to an increase in current at the branch portions, the
slots 6a to 6d are excited, and further, due to electromagnetic coupling, thestrip lines 7a-1 and 7a-2, thestrip lines 7b-1 and 7b-2, thestrip lines 7c-1 and 7c-2, and thestrip lines 7d-1 and 7d-2 are excited to radiate electromagnetic waves into the space. Here, thestrip lines 7a-1 and 7a-2, thestrip lines 7b-1 and 7b-2, thestrip lines 7c-1 and 7c-2, and thestrip lines 7d-1 and 7d-2 are arranged in the +x direction, and thus, the electromagnetic wave radiated from theantenna device 1 has a polarized wave (along a y direction) perpendicular to thesignal line 4a. - The case where the
antenna device 1 is a traveling-wave antenna will be described in detail. - A portion of electric power not radiated from the
strip lines 7a-1 and 7a-2 returns back to the feed 3 (in the -x direction) in thesignal line 4a as a reflected wave, and the remaining electric power propagates through thesignal line 4a in the +x direction. On the other hand, a portion of the electromagnetic waves propagating through thesignal line 4a after passing through thebranch line 5a excites theslot 6b intersecting with thebranch line 5b, and is radiated to the space from thestrip lines 7b-1 and 7b-2 by electromagnetic coupling. A portion of the electromagnetic waves not radiated into the space from thestrip lines 7b-1 and 7b-2 returns back toward thefeed 3 as a reflected wave, and the remaining electromagnetic waves propagate through thesignal line 4a in the +x direction. - A portion of the electromagnetic waves propagating through the
signal line 4a after passing through thebranch line 5b excites theslot 6c intersecting with thebranch line 5c, and is radiated to the space from thestrip lines 7c-1 and 7c-2 by electromagnetic coupling. A portion of the electromagnetic waves not radiated into the space from thestrip lines 7c-1 and 7c-2 returns back toward thefeed 3 as a reflected wave, and the remaining electromagnetic waves propagate through thesignal line 4a in the +x direction. Similarly, a portion of the electromagnetic waves propagating through thesignal line 4a after passing through thebranch line 5c excites theslot 6d intersecting with thebranch line 5d, and is radiated to the space from thestrip lines 7d-1 and 7d-2 by electromagnetic coupling. The remaining electromagnetic waves not radiated into the space from thestrip lines 7d-1 and 7d-2 return back toward thefeed 3 as reflected waves. - In the
antenna device 1, thestrip lines 7a-1 and 7a-2, thestrip lines 7b-1 and 7b-2, thestrip lines 7c-1 and 7c-2, and thestrip lines 7d-1 and 7d-2 are supplied with electric power by electromagnetic coupling using theslots 6a to 6d. As a result, theantenna device 1 can efficiently radiate a polarized wave (along the y direction) perpendicular to thesignal line 4a in the broadside direction. The case where theantenna device 1 is the transmission antenna has been described above. However, theantenna device 1 may be used as a reception antenna. - The total length of the conventional dipole antenna is generally about a half of the wavelength of the working frequency, and the width of the
ground 4b of theantenna device 1 is shorter than the length of the dipole antenna. Thus, theantenna device 1 only needs to have a smaller area of the ground than the conventional dipole antenna. Therefore, when a dielectric substrate formed of a material having high light transmittance is used as thedielectric substrate 2, theantenna device 1 having high transparency can be achieved. - Next, a modification of the antenna device according to the first embodiment will be described.
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FIG. 2 is a perspective view showing a configuration of an antenna device 1a which is a modification of theantenna device 1.FIG. 2 shows a front surface of the antenna device 1a. The components on the back surfaces of theantenna device 1 and the antenna device 1a are the same. The antenna device 1a includestransformers 8a to 8d andtransformers 9a to 9d in order to adjust the amount of electric power to be distributed to thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 and perform impedance matching. - As shown in
FIG. 2 , thetransformers 8a to 8d are conductor patterns formed by widening thesignal line 4a, and are first transformers extending toward thefeed 3 from the branch portions of thebranch lines 5a to 5d. Thetransformers 9a to 9d are conductor patterns connected to thetransformers 8a to 8d, and are second transformers provided in thebranch lines 5a to 5d, respectively. - The impedances of the
signal line 4a and thebranch lines 5a to 5d are transformed by thetransformers 8a to 8d and thetransformers 9a to 9d. This makes it possible to adjust the amount of electric power to be distributed to thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 and perform impedance matching. - Although
FIG. 2 shows the antenna device 1a including thetransformers 8a to 8d and thetransformers 9a to 9d, the antenna device may include either thetransformers 8a to 8d or thetransformers 9a to 9d. -
FIG. 3 is a plan view showing the configuration of an antenna device 1b which is a modification of theantenna device 1.FIG. 3 shows the back surface of the antenna device 1b. The components on the front surfaces of theantenna device 1 and the antenna device 1b are the same. Note that the front surface of the antenna device 1b may be configured as shown inFIG. 2 . The antenna device 1b is provided withslits 10a to 10d instead of theslots 6a to 6d of theantenna device 1. - The
slits 10a to 10d are holes that are partially opened. For example, each of theslits 10a to 10d has a shape in which the end on the side opposite to thefeed 3 is opened in the direction along the strip line. Thus, even if partially opened holes are used as described above, excitation is possible, and similar to theantenna device 1, the antenna device 1b can efficiently radiate a polarized wave perpendicular to thesignal line 4a in the broadside direction. -
FIG. 4 is a perspective view showing the configuration of anantenna device 1c which is a modification of theantenna device 1.FIG. 4 shows the back surface of theantenna device 1c. The components on the front surfaces of theantenna device 1 and theantenna device 1c are the same. Note that the front surface of theantenna device 1c may be configured as shown inFIG. 2 . Theantenna device 1c is provided with aground 4c instead of theground 4b in theantenna device 1. - The
ground 4c is a strip-shaped first ground provided on the back surface of thedielectric substrate 2 at a position corresponding to the position of thesignal line 4a on the front surface. The length of theground 4c in the longitudinal direction is equal to the length from one end of thedielectric substrate 2 along the longitudinal direction of theground 4c to thestrip lines 7d-1 and 7d-2 which are the closest to the other end of thedielectric substrate 2, as shown inFIG. 4 . -
Slots 6a to 6c and aslit 6e are sequentially provided along the longitudinal direction of theground 4c, and theslots 6a to 6c each have a rectangular hole shape that is long along the longitudinal direction of theground 4c. Theslit 6e is a hole that intersects with a straight line along thestrip lines 7d-1 and 7d-2 closest to the other end of thedielectric substrate 2, and the end of theslit 6e on the other end side of thedielectric substrate 2 is open. - The
ground 4c is shorter than theground 4b of theantenna device 1 in the longitudinal direction. Accordingly, in theantenna device 1c, the area of the ground is further reduced. - Therefore, when a dielectric substrate formed of a material having high light transmittance is used as the
dielectric substrate 2, theantenna device 1c can be configured to have higher transparency than theantenna device 1. - Next, characteristics of the antenna device according to the first embodiment will be described.
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FIG. 5 is a graph showing a simulation result of an electromagnetic field of the antenna device according to the first embodiment, showing a result obtained by electromagnetic field simulation of electromagnetic wave radiation of the antenna device 1a shown inFIG. 2 . As shown inFIG. 5 , the relationship between the amplitude of the electromagnetic wave radiation of the antenna device 1a and the normalized frequency is indicated by a curve A. As is clear from the curve A, the reflection coefficient is smaller than about -10 dB over the bandwidth where the fractional bandwidth is equal to or more than 2%. -
FIG. 6 is a graph showing a simulation result of electromagnetic fields of radiation patterns of electromagnetic waves radiated from theantenna device 1. InFIG. 6 , a curve B1 represents main polarization in the yz plane in the radiation patterns of the electromagnetic waves radiated from theantenna device 1, and a curve B2 represents cross polarization in the yz plane. Further, a curve C1 represents main polarization in the xy plane in the radiation patterns of the electromagnetic waves radiated from theantenna device 1, and a curve C2 represents cross polarization in the xy plane. The portion where θ is 0 degrees corresponds to the +z direction shown inFIG. 1 . As shown inFIG. 6 , theantenna device 1 can radiate a polarized wave perpendicular to thesignal line 4a in the broadside direction (+z direction and -z direction). - The configuration in which the
signal line 4a, theground 4b or theground 4c, thebranch lines 5a to 5d, and thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 are conductor patterns formed on thedielectric substrate 2 has been described above. However, the first embodiment is not limited thereto. - For example, the antenna device may have a structure in which the
signal line 4a, theground 4b or theground 4c, thebranch lines 5a to 5d, and thestrip lines 7a-1 to 7d-2 and 7a-2 to 7d-2 are composed of metal conductors, and a spacer is used instead of thedielectric substrate 2. The antenna device having such structure can also efficiently radiate a polarized wave perpendicular to thesignal line 4a in the broadside direction. - In the above description, each slot has a hole shape which is rectangular and long along the longitudinal direction of the
ground 4b or theground 4c. However, each slot may have a circular shape, an elliptical shape, or a polygonal shape. - Each of the
strip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 may be a conductor pattern that is widened toward the leading end. When each of thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 is widened toward the leading end, the bandwidth of the antenna device can be broadened. - Each of the
strip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 may be a conductor pattern in which the leading end is folded back. When each of thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 has a shape in which the leading end is folded back, the length of each of thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 in the y direction can be decreased, whereby the antenna device can be downsized. - The
antenna devices 1 and 1a to 1c may be provided with a polarizer. For example, the polarizer is disposed in parallel with the radiation direction of the electromagnetic wave of each of the antenna devices. This allows the antenna devices to operate as circularly polarized antennas. - An array antenna according to the first embodiment is a planar array antenna including a plurality of antenna devices according to the first embodiment.
FIG. 7 is a plan view showing the configuration of the array antenna according to the first embodiment. InFIG. 7 , anarray antenna 11 includes threeantenna devices 1. The threeantenna devices 1 are arranged in parallel along the width direction of theground 4b. In this way, the planar array antenna can be achieved by using a plurality ofantenna devices 1. - Further, a phased array antenna capable of scanning a beam in an arbitrary direction can be achieved by individually supplying electric power to each
antenna device 1 in thearray antenna 11. AlthoughFIG. 7 shows thearray antenna 11 using the plurality ofantenna devices 1, the array antenna according to the first embodiment can also be configured by using a plurality of any of the antenna devices 1a to 1c. For example, a plurality ofantenna devices 1c may be arranged in parallel along the width direction of theground 4c to form an array antenna. Further, theantenna device 1, the antenna device 1a, and the antenna device 1b may be arranged in parallel along the width direction of theground 4b to form an array antenna. - As described above, the
antenna device 1 according to the first embodiment has theground 4b having a strip shape parallel to thesignal line 4a, thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 each extending from theground 4b,slots 6a to 6d intersecting with respective straight lines along thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2, andbranch lines 5a to 5d, each of thebranch lines 5a to 5d intersecting with thecorresponding slot 6a to 6d located on the back surface as viewed transparently from the front surface side. The current in the branch portions where thebranch lines 5a to 5d are branched from thesignal line 4a is increased, whereby thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 are supplied with electric power by electromagnetic coupling using theslots 6a to 6d. Thus, theantenna device 1 can efficiently radiate a polarized wave perpendicular to thesignal line 4a in the broadside direction. - The antenna device 1a according to the first embodiment includes
transformers 8a to 8d provided in thesignal line 4a andtransformers 9a to 9d provided in thebranch lines 5a to 5d. Due to these components, the antenna device 1a can adjust the amount of electric power to be distributed to thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 and perform impedance matching. - The antenna device 1b according to the first embodiment includes
slits 10a to 10d. Similar to theantenna device 1, the antenna device 1b can efficiently radiate a polarized wave perpendicular to thesignal line 4a in the broadside direction, even if theslots 6a to 6d are replaced with theslits 10a to 10d. - In the
antenna device 1c according to the first embodiment, the length of theground 4c in the longitudinal direction is equal to the length from one end of thedielectric substrate 2 along the longitudinal direction of theground 4c to thestrip lines 7d-1 and 7d-2 which are the closest to the other end of thedielectric substrate 2. Theslit 6e that intersects with a straight line along thestrip lines 7d-1 and 7d-2 closest to the other end of thedielectric substrate 2 is open on the other end side of thedielectric substrate 2. Theground 4c is shorter than theground 4b in the longitudinal direction, and therefore, the area of the ground is further reduced. This configuration enables theantenna device 1c to have high transparency. - The
array antenna 11 according to the first embodiment includes a plurality ofantenna devices 1 and 1a to 1c which is arranged in parallel along the width direction of theground -
FIG. 8 is a perspective view showing the configuration of anantenna device 1d according to the second embodiment of the present invention, and shows the front surface of theantenna device 1d. InFIG. 8 , theantenna device 1d includes adielectric substrate 2 that is a first dielectric substrate, conductor patterns formed on both surfaces of thedielectric substrate 2, adielectric substrate 12 that is a second dielectric substrate, and aground 13 provided on thedielectric substrate 12. In theantenna device 1d shown inFIG. 8 , thedielectric substrate 2 and the conductor patterns formed on both surfaces of thedielectric substrate 2 are the same as those shown inFIGS. 1 and2 . - The
dielectric substrate 12 is disposed in parallel with and apart from thedielectric substrate 2. For example, thedielectric substrate 12 is disposed apart from thedielectric substrate 2 in the -z direction by about a quarter wavelength. - The
ground 13 is a second ground provided on the surface of thedielectric substrate 12 that faces the back surface of thedielectric substrate 2. Theground 13 may be a solid ground provided on the entire surface of thedielectric substrate 12, or may be a mesh-shaped ground. - As described above, the antenna device according to the first embodiment can efficiently radiate a polarized wave perpendicular to the
signal line 4a in the broadside direction. However, the beam of electromagnetic waves emitted from the antenna device is formed on both the +z side and the -z side. - On the other hand, in the
antenna device 1d according to the second embodiment, thedielectric substrate 12 is disposed apart from thedielectric substrate 2 by a quarter wavelength in the -z direction, and theground 13 is provided on the surface of thedielectric substrate 12 facing the back surface of thedielectric substrate 2. - The beam of the electromagnetic waves emitted from the
antenna device 1d is limited to be formed in the +z direction by theground 13 of thedielectric substrate 12. Therefore, theantenna device 1d can form a sharper beam than the antenna device according to the first embodiment, and can limit the radiation direction of electromagnetic waves to one direction. - The holes provided in the first ground of the
antenna device 1d may be theslots 6a to 6d and theslit 6e described in the first embodiment. The shape of the slot may be circular, elliptical or polygonal. Further, the holes provided in the first ground in theantenna device 1d may be theslits 10a to 10d described in the first embodiment instead of the slots. - Furthermore, the first strip lines in the
antenna device 1d may be thestrip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 described in the first embodiment. Each of the strip lines may be widened toward the leading end, or may be folded at the leading end. When each of the strip lines is widened toward the leading end, the bandwidth of theantenna device 1d can be broadened. When each of the strip lines is folded at the leading end, theantenna device 1d can be downsized. - The
antenna device 1d may be provided with a polarizer. For example, the polarizer is disposed in parallel with the radiation direction of the electromagnetic wave of theantenna device 1d. This allows theantenna device 1d to operate as a circularly polarized antenna. - An array antenna according to the second embodiment is a planar array antenna including a plurality of
antenna devices 1d. For example, the planar array antenna is constructed by arranging a plurality ofantenna devices 1d in parallel along the width direction of theground 4b. - As described above, the
antenna device 1d according to the second embodiment includes thedielectric substrate 12 disposed in parallel with and apart from thedielectric substrate 2, and theground 13 provided on the surface of thedielectric substrate 12 facing the back surface of thedielectric substrate 2. With this configuration, theantenna device 1d can form a sharper beam than the antenna device according to the first embodiment, and can limit the radiation direction of electromagnetic waves to one direction. - In the
antenna device 1d according to the second embodiment, theground 13 has a mesh shape. This configuration enables theantenna device 1d to have higher transparency by using a dielectric substrate having higher light transmission as thedielectric substrate 12. -
FIG. 9 is a perspective view showing the configuration of an antenna device 1e according to the third embodiment of the present invention, and shows the front surface of the antenna device 1e. InFIG. 9 , the antenna device 1e includes adielectric substrate 2 that is a first dielectric substrate, conductor patterns formed on both surfaces of thedielectric substrate 2, adielectric substrate 14 that is a third dielectric substrate, and a conductor pattern provided on thedielectric substrate 14. In the antenna device 1e shown inFIG. 9 , thedielectric substrate 2 and the conductor patterns formed on both surfaces of thedielectric substrate 2 are the same as those shown inFIGS. 1 and2 . - The
dielectric substrate 14 is disposed in parallel with and apart from thedielectric substrate 2. For example, thedielectric substrate 14 is disposed apart from thedielectric substrate 2 in the -z direction by about a quarter wavelength. Thedielectric substrate 14 hasstrip lines 15a to 15d provided on the surface facing the back surface of thedielectric substrate 2. The strip lines 15a to 15d are second strip lines provided to face thestrip lines 7a-1, 7a-2 to 7d-1, and 7d-2 provided on thedielectric substrate 2. - For example, a beam of an electromagnetic wave radiated from the
strip lines 7a-1 and 7a-2 is limited to be formed in the +z direction by thestrip line 15a provided on thedielectric substrate 14 at the position facing thestrip lines 7a-1 and 7a-2. In this way, the radiation direction of beams of the electromagnetic waves emitted from the antenna device 1e is limited to the +z direction by thestrip lines 15a to 15d provided on thedielectric substrate 14. Therefore, the antenna device 1e can form a sharper beam than the antenna device according to the first embodiment, and can limit the radiation direction of electromagnetic waves to one direction. - Further, since the
strip lines 15a to 15d have a smaller area of conductor patterns than theground 13 shown in the second embodiment, the antenna device 1e having high transparency can be achieved. - The holes provided in the first ground of the antenna device 1e may be the
slots 6a to 6d and theslit 6e described in the first embodiment. The shape of the slot may be circular, elliptical or polygonal. Further, the holes provided in the first ground in the antenna device 1e may be theslits 10a to 10d described in the first embodiment instead of the slots. - Each of the first strip lines and the second strip lines in the antenna device 1e may have a conductor pattern which is widened toward the leading end or which is folded at the leading end. When each of the strip lines is widened toward the leading end, the bandwidth of the antenna device 1e can be broadened. When each of the strip lines is folded at the leading end, the antenna device 1e can be downsized.
- The antenna device 1e may be provided with a polarizer. For example, the polarizer is disposed in parallel with the radiation direction of the electromagnetic wave of the antenna device 1e. This allows the antenna device 1e to operate as a circularly polarized antenna.
- An array antenna according to the third embodiment is a planar array antenna including a plurality of antenna devices 1e. For example, the planar array antenna is constructed by arranging a plurality of antenna devices 1e in parallel along the width direction of the
ground 4b. - As described above, the antenna device 1e according to the third embodiment includes the
dielectric substrate 14 disposed in parallel with and apart from thedielectric substrate 2, and thestrip lines 15a to 15d provided on thedielectric substrate 14. The strip lines 7a-1 to 7d-1 and 7a-2 to 7d-2 provided on thedielectric substrate 2 face thestrip lines 15a to 15d provided on thedielectric substrate 14, respectively. - With this configuration, the antenna device 1e can form a sharper beam than the antenna device according to the first embodiment, and can limit the radiation direction of electromagnetic waves to one direction.
- The present invention is not limited to the above embodiments, and two or more of the above embodiments can be freely combined, or arbitrary components in the embodiments can be modified or omitted, within the scope of the present invention.
- The antenna device according to the present invention can efficiently radiate a polarized wave perpendicular to the signal line in the broadside direction, and thus can be used in, for example, a radar and a wireless communication device.
- 1, 1a, 1b, 1c, 1d, 1e: antenna device, 2, 12, 14: dielectric substrate, 3: feed, 4a: signal line, 4b, 4c, 13: ground, 5a, 5b, 5c, 5d: branch line, 6a, 6b, 6c, 6d: slot, 7a-1 to 7d-1, 7a-2 to 7d-2, 15a, 15b, 15c, 15d: strip line, 8a, 8b, 8c, 8d, 9a, 9b, 9c, 9d: transformer, 6e, 10a, 10b, 10c, 10d: slit, 11: array antenna
Claims (14)
- An antenna device comprising:a first ground provided on a first surface and having a strip shape;a plurality of first strip lines provided on the first surface, each of the first strip lines being disposed along a longitudinal direction of the first ground;a plurality of holes provided in the first ground;a signal line provided on a second surface facing opposite to the first surface, the signal line being parallel to the first ground; anda plurality of branch lines provided on the second surface and branched from the signal line; whereinthe strip shape of the first ground is parallel to the signal line,each of the first strip lines is a strip line extending from the first ground,each of the holes intersects with a straight line along a corresponding one of the first strip lines, andeach of the branch lines intersects with a corresponding one of the holes located on the first surface when viewed transparently from the second surface side.
- The antenna device according to claim 1, wherein
the first surface is one surface of a first dielectric substrate, and
the second surface is the other surface of the first dielectric substrate. - The antenna device according to claim 1, comprising
a first transformer provided in the signal line. - The antenna device according to claim 1, comprising
a second transformer provided in the branch lines. - The antenna device according to claim 1, wherein
each of the first strip lines is orthogonal to the first ground. - The antenna device according to claim 1, wherein
each of the holes is partially open. - The antenna device according to claim 2, wherein
a length of the first ground in the longitudinal direction is equal to a length from one end of the first dielectric substrate along the longitudinal direction of the first ground to a first strip line closest to the other end of the first dielectric substrate, and
one of the holes intersecting with a straight line along the first strip line closest to the other end of the first dielectric substrate is open on a side of the other end of the first dielectric substrate. - The antenna device according to claim 2, comprising:a second dielectric substrate disposed in parallel with and apart from the first dielectric substrate; anda second ground provided on a surface of the second dielectric substrate facing the first surface.
- The antenna device according to claim 8, wherein
the second ground has a mesh shape. - The antenna device according to claim 2, comprising:a third dielectric substrate disposed in parallel with and apart from the first dielectric substrate; anda plurality of second strip lines provided on a surface of the third dielectric substrate facing the first surface; whereineach of the first strip lines faces a corresponding one of the second strip lines.
- The antenna device according to claim 1, wherein
each of the holes is either circular, elliptical, or polygonal. - The antenna device according to claim 10, wherein
each shape of the first strip lines and the second strip lines is widened toward its leading end. - The antenna device according to claim 10, wherein
each shape of the first strip lines and the second strip lines is folded back at its leading end. - An array antenna comprising
a plurality of the antenna devices according to any one of claims 1 to 13, wherein
each of the antenna devices is disposed in parallel along a width direction of the first ground.
Applications Claiming Priority (1)
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PCT/JP2018/019860 WO2019224949A1 (en) | 2018-05-23 | 2018-05-23 | Antenna device and antenna array |
Publications (3)
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EP3780277A1 true EP3780277A1 (en) | 2021-02-17 |
EP3780277A4 EP3780277A4 (en) | 2021-04-07 |
EP3780277B1 EP3780277B1 (en) | 2022-10-19 |
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EP18919437.6A Active EP3780277B1 (en) | 2018-05-23 | 2018-05-23 | Antenna device and antenna array |
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US (1) | US11437734B2 (en) |
EP (1) | EP3780277B1 (en) |
JP (1) | JP6498367B1 (en) |
WO (1) | WO2019224949A1 (en) |
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US11482794B1 (en) * | 2019-05-17 | 2022-10-25 | Ball Aerospace & Technologies Corp. | Slot-fed unit cell and current sheet array |
US11688952B1 (en) * | 2020-12-02 | 2023-06-27 | Ball Aerospace & Technologies Corp. | Current sheet array antenna |
JP7245947B1 (en) * | 2022-08-15 | 2023-03-24 | Fcnt株式会社 | Printed wiring boards and wireless communication terminals |
Family Cites Families (12)
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FR2487588A1 (en) * | 1980-07-23 | 1982-01-29 | France Etat | DOUBLE REPLIES IN PLATES FOR VERY HIGH FREQUENCY AND NETWORKS OF SUCH DOUBLETS |
KR100207600B1 (en) * | 1997-03-31 | 1999-07-15 | 윤종용 | Cavity-backed microstrip dipole antenna array |
JP3490304B2 (en) * | 1997-10-17 | 2004-01-26 | シャープ株式会社 | Wireless communication device |
KR100264817B1 (en) * | 1998-06-09 | 2000-09-01 | 박태진 | Wideband microstrip dipole antenna array |
JP2003168922A (en) | 2001-11-30 | 2003-06-13 | Hitachi Cable Ltd | Antenna |
JP4424276B2 (en) * | 2005-07-19 | 2010-03-03 | 三菱電機株式会社 | Linear array antenna and conductor flat plate for antenna |
FR2946805B1 (en) * | 2009-06-11 | 2012-03-30 | Alcatel Lucent | RADIANT ELEMENT OF ANTENNA |
US8269675B2 (en) * | 2009-06-23 | 2012-09-18 | Apple Inc. | Antennas for electronic devices with conductive housing |
JP5776625B2 (en) * | 2012-05-11 | 2015-09-09 | 日立金属株式会社 | Power distribution synthesizer |
TWI521792B (en) * | 2012-09-07 | 2016-02-11 | 啟碁科技股份有限公司 | Dual-band antenna |
US20140104157A1 (en) * | 2012-10-15 | 2014-04-17 | Qualcomm Mems Technologies, Inc. | Transparent antennas on a display device |
WO2018221403A1 (en) * | 2017-05-30 | 2018-12-06 | 日立金属株式会社 | Planar array antenna and wireless communication module |
-
2018
- 2018-05-23 JP JP2018553256A patent/JP6498367B1/en active Active
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US20210013627A1 (en) | 2021-01-14 |
WO2019224949A1 (en) | 2019-11-28 |
EP3780277B1 (en) | 2022-10-19 |
EP3780277A4 (en) | 2021-04-07 |
US11437734B2 (en) | 2022-09-06 |
JP6498367B1 (en) | 2019-04-10 |
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